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AN AUTOMATIC TUNING-FORK HAMMER.
BY S. S. BISHOP, M.D.,OF CHICAGO.The automatic tuning-fork hammer shown in the cut is for the purpose of making the fork as accurate an instrument for testing the hearing as the watch is, and especially for use in those cases where the watch is useless.The hammer and operating springs can be attached to any large fork an aurist may happen to have. The hammer-head is made of soft rubber, so as not to require too large a room for its use.In determining the hearing distance the same rules are observed as in using the watch. The ear is gradually approached from a distance, with the fork vibrating, until the patient, with eyes closed, signifies that he hears it. This experiment is repeated until we find by measurement the exact distance at which he hears it each time. Every time a sound is
NEW INSTRUMENTS. JAMA. 1891;XVI(25):891–892. doi:10.1001/jama.1891.02410770027002
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